Mouth-piece for speaking-tubes



(No ModeL) w. N. ROSS.

MOUTH PIECE FOR SPEAKING TUBES.

Patented Dec. 29, 1891.-

In Men for A/ @014 mire s UNITED STATES PATENT OFFICE.

WILLIAM H. ROSS, OF CAMDEN, NEIV JERSEY, ASSIGNOR OF ONE-HALF TOIVILLIAM BRYANT, OF PHILADELPHIA, PENNSYLVANIA.

MOUTH-PIECE FOR SPEAKING-TUBES.

SYECIFICATION forming part of Letters Patent No. 466,140, dated December29, 1891.

Application filed April 21, 1891. Serial No. 389,855. (No model.)Patented in Germany March 31,1891, No. 19,257; in England March 31,189L110. 5,571; in France March 31, 1891, No. 199,301, and inBelgiumMarch 31,1891,No.71,03l.

To all whom it may concern:

Be it known that I, WILLIAM H. Ross, of Camden, in the county of Camden,State of New Jersey, have invented certain new and useful Improvementsin Mouth -Pieces for Speaking-Tubes, of which the following is aspecification, due reference beinghad to the accompanying drawings,which illustrate my invention and form part hereof.

The object of my present invention is to avoid the blocking of thepassage to the tube by the whistle assuming a vertical position at therear of its chamber by reason of excessive air-pressure applied throughthe near mouth-piece to the tube to sound a call or alarm at the far endof the tube, and to at all times insure a free or comparatively freepassage for an applied air-current, for the purpose set forth; and tothe end sought it consists of the construction, combination,andarrangement of parts shown in the drawings, and hereinafter particularlydescribed and claimed.

Figure 1 represents the forced vertical po- 2 5 sition of the whistle tothe rear of its chamber when an excessive air-pressure is appliedthrough the near mouth-piece proper to the tube for the purpose ofsounding a call or alarm at the far mouth-piece, and showing prongsor-projections on the whistle abutting against the rear shoulder of itschamber and preventing the blocking of the passage to the tube andinsuring space about the whistlefor the passing of-the appliedair-current to the 5 tube to accomplish its purpose; and Fig. 2isaperspective view of the whistle removed from its chamber.

In the drawings, A is the mouth-piece, and a the mouth-piece proper.

B is the whistle of the common and wellknown type employed inmouth-pieces for speaking-tubes, and b are prongs or pro3ections on saidwhistle, for a purpose presently set forth.

0 is the chamber, it being preferably a cy- 5 lindrical shell and havingthe shoulders c c on its inner surface at its ends. The diameter of thechamber 0 is of size slightly in excess of the diameter of the whistleB, and the diameter of the latter is of size slightly inexcess of thediameter of the passage-ways a and c of the mouth-piece.

The whistle is placed within the chamber with its pronged side towardthe rear thereof, and when by reason of excessive airpressure appliedthrough the near mouth-piece proper toward the tube the whistle isforced to assume a vertical position at the rear of its chamber theprongs thereon abut against the shoulder c ofthe chamber and hold it offtherefrom sufliciently far to effectually prevent the blocking of thepassage-way etc the tube and allow ample space about thewhistle for theescape or passing of the applied aircurrent to the tube.

It will be understood that the prongs or projections on the whistlemay-be conveniently formed or struck up with 'one of the shells of thewhistle and caused to assume a position at right angles with the body ofthe Whistle in final construction, as shown in the drawings, or they maybe pins or the like soldered or otherwise fixed to and forming a part ofthe whistle to the same end.

Having thus described my invention, I claim In mouth-pieces forspeaking-tubes of the character herein described, a valve or whistlelocated therein free of an y attachment thereto and provided on one sidewith one or more So prongs or projections, as and for the purpose setforth.

In testimony whereof I have hereunto signed my name this 28th day ofOctober, A. D. 1890.

WM. II. ROSS.

In presence of- JOHN JOLLY, Jr.,

W. ALEX. ROBINSON.

